We ran a similar test to the parallel trace one...used Y-coupons from pwb
panel.  Results same as previously described..Twist on the test was to also
run an identical coupon except put 1-2 mils of acrylic conformal coat over
traces.  Even tho power/water drop was maintained, no ---migration after 2
months.  (I know speaking of conformal coat is like
fingernails-on-chalkboard to you commercial tykes...sorry)

Ralph Vaughan
Boeing-Atlanta

> ----------
> From:         Ingemar Hernefjord
> (EMW)[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Ingemar Hernefjord (EMW)
> Sent:         Friday, March 17, 2000 9:09 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Electromigration demonstration...
>
> Reminds of my own experiment years ago, Brian. I sent pictures to Steve,
> would be interesting to compare. Silver migration is not anything
> remarkable, but seemingly, few saw it  happen live. /Ingemar
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: den 17 mars 2000 09:09
> To: [log in to unmask]
> Subject: Re: [TN] Electromigration demonstration...
>
>
> Steve
>
> The original dendrite wizard was Charles Jennings (if my memory is good)
> in some US
> Govt lab (Sandia???) in the 1970s. He actually made a 16 mm film of it
> happening (I
> have a PAL video copy of it). He said that dendrite formation could be
> thus provoked on
> any substrate between any metals, but the rate and form was very variable
> for a given
> ionic contamination level.
>
> I recommend you put a 10 - 47 kilohm R in series with your battery: it
> will reduce the
> gas formation and keep the dendrites intact longer, because the current is
> smaller.
>
> BTW, this is not electromigration, it is electrochemical migration, two
> different
> things. The latter is ionic in nature.
>
> Brian
>
> "Stephen R. Gregory" wrote:
>
> > How the heck are yew good ol' boys doin'?
> >
> > (Spitoooie!!)...'scuse me thar...hadda get rid of my chew, cain't talk
> with a
> > mouthful of terbacky...(hitchin' my bib overalls up)
> >
> > Anyhoo, a while back, some good ol' boy posted a simple way to actually
> show
> > electromigration (fancy word for us country boys ain't it) in
> progress...you
> > could actually see it happening. Something about using an overhead
> projector
> > and a 9-volt battery...or something like that.
> >
> > Does anybody remember that? I need some way to graphically show this
> > phenomena  happening...('nuther fancy word huh?...phenomena...)
> >
> > YEEEE-HAW!!!
> > (that's good ol' boy talk for thanks a lot!)
> >
> > -Steve "Jethro" Gregory- (GRIN)
> >
> > ##############################################################
> > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> > ##############################################################
> > To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> > the body:
> > To subscribe:   SUBSCRIBE TECHNET <your full name>
> > To unsubscribe:   SIGNOFF TECHNET
> > ##############################################################
> > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> > information.
> > If you need assistance - contact Keach Sasamori at [log in to unmask] or
> > 847-509-9700 ext.5315
> > ##############################################################
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information.
> If you need assistance - contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> ##############################################################
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information.
> If you need assistance - contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> ##############################################################
>

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################